M25PX16 Serial Flash Embedded Memory
Operating Features
Table 3: Software Protection Truth Table
Sector Lock Register
Bits
Lock Down Write Lock
Protection Status
0
0
1
0
1
0
Sector unprotected from PROGRAM / ERASE / WRITE operations; protection status reversible
Sector protected from PROGRAM / ERASE / WRITE operations; protection status reversible
Sector unprotected from PROGRAM / ERASE / WRITE operations; protection status cannot be
changed except by a power-up.
1
1
Sector protected from PROGRAM / ERASE / WRITE operations; protection status cannot be
changed except by a power-up.
Hardware Data Protection
Hardware data protection is implemented using the write protect signal applied on the
W#/VPP pin. This freezes the status register in a read-only mode, protecting the block
protect (BP) bits and the status register write disable bit (SRWD). The device is ready to
accept a BULK ERASE command only if all block protect bits are 0.
Table 4: Sectors 0 to 32, Protected Area Sizes – Upper Area Protection
Status Register Content
Memory Content
Unprotected Area
Top/Bottom Bit
BP 2
BP 1
BP 0 Protected Area
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
none
All sectors 1
Upper 32nd (sector 31)
Upper 16th (sectors 30 to 31)
Upper 8th (sectors 28 to 31)
Upper 4th (sectors 24 to 31)
Upper half (sectors 16 to 31)
All sectors
Lower 31/32nds (sectors 0 to 30)
Lower 15/16ths (sectors 0 to 29)
Lower 7/8ths (sectors 0 to 27)
Lower 3/4ths (sectors 0 to 23)
Lower half (sectors 0 to 15)
none
All sectors
none
1. The device is ready to accept a BULK ERASE command only if all block protect bits are 0.
Note:
Table 5: Sectors 0 to 32, Protected Area Sizes – Lower Area Protection
Status Register Content
Memory Content
Top/Bottom Bit
BP 2
BP 1
BP 0 Protected Area
Unprotected Area
1
1
1
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
none
All sectors 1
Lower 32nd (sector 0)
Lower 16th (sectors 0 to 1)
Lower 8th (sectors 0 to 3)
Lower 4th (sectors 0 to 7)
Lower half (sectors 0 to 15)
All sectors
Upper 31/32nds (sectors 1 to 31)
Upper 15/16ths (sectors 2 to 31)
Upper 7/8ths (sectors 4 to 31)
Upper 3/4ths (sectors 8 to 31)
Upper half (sectors 16 to 31)
none
PDF: 09005aef845665a5
m25px16.pdf - Rev. A 11/12 EN
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